In an Elastic Collision Between Two Bodies of Mass M1 $\theta$

question 22

Multiple Choice

In an elastic collision between two bodies of mass m1 and m², with m² initially at rest, mass 1 moves off at angle $\theta$ relative to the direction of its initial velocity and mass 2 at angle $\phi$ . An exam paper shows the equations below: m1v1i
0
= m1v1f cos $\theta$ + m²v2f sin $\phi$
= m1v1f sin $\theta$ + m²v2f cos $\phi$
What error(s) has the student made?

• A)In the first equation, m²v2f sin\(\phi\) should be m²v2f cos\(\phi\).
• B)In the second equation, m²v2f cos\(\phi\) should be m²v2f sin\(\phi\).
• C)In the second equation, the plus sign between the terms on the right should be a minus sign.
• D)All of the errors listed above.
• E)Only errors (a) and (b) above.

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